THE INTERACTION OF ENDOCRINE AND EXPERIENTIAL FACTORS IN THE REGULATION OF SEXUAL BEHAVIOUR IN THE FEMALE GUPPY POECILIA RETICULATA by N. R. LILEY AND W. WISHLOW 1) (Department of Zoology, U.B.C., Vancouver, B.C., Canada) (with 5 Figures) (Rec. 20-XII-1972) INTRODUCTION The study reported in this paper is aimed at understanding the factors regulating receptivity in the female guppy, Poecilia reticulata. Previous work has shown that nonvirgin females undergo cyclical changes in recep- tivity, being maximally receptive shortly after parturition (LILEY, 1966). Experiments involving ovariectomy and hormone replacement therapy in- dicate that ovarian hormones play an important role in the regulation of receptivity (LILEY, 1972). However, there is evidence that sexual receptivity in the mature female is not completely dependent upon ovarian hormone(s): females may be highly responsive several days or weeks after ovariectomy (LILEY, 1968, 1972). Furthermore, the great majority of virgin females are highly responsive at the first encounter with a male even though there is no reason to expect all individuals in a group of virgin fish to have ovaries in a similar condition, i.e., at the same stage of a cycle of vitellogenesis and, presumably, steroidogenesis. Responsiveness of intact and ovariectomized virgin females exposed to
Behaviour – Brill
Published: Jan 1, 1974
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